Clone this into your QMK installation, inside the redox dir.
cd ~/qmk_firmware/keyboards/redox/keymaps
git clone git@github.com/elmarcoh/redox-ark.git
Then you can compile with
qmk compile -kb redox/rev1 -km ark
and then flash with
qmk flash -kb redox/rev1 -km ark
Then reset the keyboard; the reset combo is the first little key on the thumb cluster + q